//
//  MainTabbar.swift
//  SinaWeibo
//
//  Created by 张子国 on 15/11/10.
//  Copyright © 2015年 张子国. All rights reserved.
//

import UIKit

class MainTabbar: UITabBar {

    //重写构造方法
    override init(frame: CGRect) {
        super.init(frame: frame)
        setupUI()
    }

    //默认只支持代码构造
    required init?(coder aDecoder: NSCoder) {
        fatalError("init(coder:) has not been implemented")
    }
    
    //MARK: 添加子视图控制器
    private func setupUI() {
       
        addSubview(composeBtn)
    }
    
    //设置布局
     override func layoutSubviews() {
        
        super.layoutSubviews()
        
        //遍历所有视图
        
        let w = self.bounds.width / 5
        let h = self.bounds.height
        let rect = CGRect(x: 0, y: 0, width: w, height: h)
        
        var index : CGFloat = 0
        
        for subView in subviews {
            if subView .isKindOfClass(NSClassFromString("UITabBarButton")!) {
                //修改frame
                subView.frame = CGRectOffset(rect, index * w, 0)
//                                if index == 1 {
//                                    index++
//                                }
//                                index++
                
                //三目
                index += index == 1 ? 2 : 1

            }
        }
        
        composeBtn.frame = CGRectOffset(rect, w * 2,0)
        bringSubviewToFront(composeBtn)

        
        
        
    }

   //MARK: 懒加载控件
    lazy var composeBtn : UIButton = {
        let btn = UIButton ()
        
        btn .setBackgroundImage(UIImage (imageLiteral: "tabbar_compose_button"), forState: UIControlState.Normal)
        btn.setBackgroundImage(UIImage(imageLiteral: "tabbar_compose_button_highlighted"), forState: UIControlState.Highlighted)
        btn.setImage(UIImage(named: "tabbar_compose_icon_add"), forState: UIControlState.Normal)
        btn.setImage(UIImage(named: "tabbar_compose_icon_add_highlighted"), forState: UIControlState.Highlighted)
        btn.sizeToFit()

        
        return btn
    }()
   

}
